Question
Is there such a thing as hiring someone at a minimum hourly wage and then offering additional pay based on a factor?
Alternative Question
Could this be done legally (from a US tax perspective) if I was hired as salary?
Example
A delivery driver is hired at minimum wage but is given an additional $5 for every delivery done during their shift. So a simple example where minimum wage is $8:
2 hours ($16) + 10 deliveries ($50) = $66
My Research
From my limited research it seems the way this is typically handled is to pay the normal hourly wage and everything else is reported as a bonus.
UPDATE / CLARIFICATIONS
I asked this question because there is a new business in town offering delivery drivers minimum wage an hour but they haven't decided how to handle excess profit. They charge a set delivery fee based on distance which on average means 3 deliveries an hour would pay my wage for that hour. The company wants to pay its drivers more and does not need the profits from the delivery side of the business. Their looking at offering bonuses or commissions right now and do not want to do the standard delivery driver thing where you earn $2 something an hour and are supposed to make the rest in tips.
Their willing to listen to suggestions right now so I'm really looking to offer them a suggestion that makes me more money (my taxes in mind) but also helps them out (their taxes in mind).